AD 82-01-04 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 25 | Airworthiness Directives; Gates Learjet Model 25, 25A, 25B and 25C Series Airplanes |
| aircraft | Learjet Inc. | 25A | Airworthiness Directives; Gates Learjet Model 25, 25A, 25B and 25C Series Airplanes |
| aircraft | Learjet Inc. | 25B | Airworthiness Directives; Gates Learjet Model 25, 25A, 25B and 25C Series Airplanes |
| aircraft | Learjet Inc. | 25C | Airworthiness Directives; Gates Learjet Model 25, 25A, 25B and 25C Series Airplanes |
Unsafe Condition
Failure of the horizontal stabilizer trim actuator could result in loss of pitch control due to jamming or improper operation of the actuator during flight.
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Required Actions
Inspect and modify the horizontal stabilizer trim actuator system using specified modification kits (AMK 81-9, AMK 81-10, AMK 80-13 Change 3) by the compliance dates. Update the Airplane Flight Manual with approved changes and perform recurring inspections of the stall warning accelerometer unit every 220 hours time-in-service.
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Compliance Time
On or before the compliance date specified in Table I (October 31, 1982 for 25B/C models and August 31, 1982 for 25, 25A models).
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Affected Aircraft
Gates Learjet Models 25, 25A, 25B, 25C with serial numbers 25-003 through 25-066 (except 25-061) and 25-061, 25-067 through 25-205.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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